/*************************************************************************
	> File Name: eat.cpp
	> Author:jason 
	> Mail:3297294149@qq.com 
	> Created Time: Sat 22 Jul 2023 10:16:39 AM CST
 ************************************************************************/

#include<iostream>
using namespace std;
int f(int n)
{
    if (n==1) return 1;
    return 2*(f(n-1)+1);
}
int main()
{
    int n;
    cin >> n;
    cout << f(n)<< endl;
    return 0;
}
